Question

要创建一个函数来确定对象的属性为空或包含双引号，如下所示

代码##标题##

private ReturlFalseIfObjectPropertiesEmpty(a) {
    Object.getOwnPropertyNames != undefined ? Object.getOwnPropertyNames(a).length != 0 : (
      function() {
         for (const key in a) return (key != undefined) && (key != "");
      }) ();
    }

我需要验证的数据

标题

const data = [{"employeeContact": {
        "personalPhone": "",
        "workPhone": "",
        "personalEmail": "",
        "workEmail": "",
        "currentAddress": "",
        "permanentAddress": ""
      }}
    ];

Answer 1

您可以尝试通过以下建议的方法检查对象中的空值或空字符串：

注意：所有这些结果都显示了一个新的对象数组，这些对象的属性没有空值或''

如果您希望获得其他结果，则显示具有空值或''的字段，则可以将以下条件从 value！= 更改为 value = =” 为您提供理想的结果。

样本数据

const data = [{"employeeContact": {
    "personalPhone": "",
    "workPhone": "",
    "personalEmail": "",
    "workEmail": "",
    "currentAddress": "sample",      // Supplied one with a value
    "permanentAddress": ""
  }}
];

方法1-将ES7 For Loop与Object.entries一起使用

const employeeContract = data[0].employeeContact;
let result = [];

for (const [key, value] of Object.entries(employeeContract)) {
  if (value != '') result.push({ [key]: value });   // This will push a new object with its existing key and assign its value if the object is not empty. Ex. { personalPhone: 'sample'}
}

console.log(result);   // [ { currentAddress: 'sample' } ]

方法2-使用ES7 Object.entries（简化）进行过滤

const employeeContract = data[0].employeeContact;
const result = Object.entries(employeeContract).filter(([key, value]) => value != '' ? { [key]: value } : null);

console.log(result);   // [ { currentAddress: 'sample' } ]

要在Typescript中使用Object.entries，您需要编辑 tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",        // Use es2017 to use all of its features
    "module": "commonjs",
    "strict": true,
    "esModuleInterop": true
  }
}

// Or if you are using ES6 and you only want to use the ES7 Object.entries() feature then, just supply values on the "lib" property
{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "strict": true,
    "esModuleInterop": true,
    "lib": ["es6", "dom", "es2017.object"]   // Add this line to enable using Object.entries()
  }
}

希望这会有所帮助

如何在打字稿中检查对象属性的空值

标题

1 个答案: